| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| LURUF | Lupinus rubens Rydb. var. flavoculatus (Heller) C.P. Sm. | Lupinus flavoculatus | Fabaceae
|
| LURU4 | Lupinus rubens Rydb. | Lupinus pusillus ssp. rubens | Fabaceae
|
| LURU3 | Lupinus ruber Heller | red lupine | Fabaceae
|
| LURU5 | Lupinus rubricaulis Greene | Lupinus argenteus ssp. rubricaulis | Fabaceae
|
| LURY | Lupinus rydbergii Blank. | Lupinus wyethii ssp. wyethii | Fabaceae
|
| LUSA4 | Lupinus sabinei Dougl. ex Hook. | Lupinus sabinianus | Fabaceae
|
| LUSA3 | Lupinus sabinianus Dougl. ex Lindl. | Sabin's lupine | Fabaceae
|
| LUSAS3 | Lupinus sabulii C.P. Sm. var. subpersistens C.P. Sm. | Lupinus polyphyllus ssp. superbus | Fabaceae
|
| LUSA5 | Lupinus sabulii C.P. Sm. | Lupinus polyphyllus ssp. superbus | Fabaceae
|
| LUSA8 | Lupinus sabulosus Heller | Lupinus bicolor ssp. umbellatus var. umbellatus | Fabaceae
|
| LUSAS | Lupinus saxosus T.J. Howell var. saxosus | rock lupine | Fabaceae
|
| LUSAS2 | Lupinus saxosus T.J. Howell var. subsericeus (B.L. Robins. ex Piper) C.P. Sm. | rock lupine | Fabaceae
|
| LUSA2 | Lupinus saxosus T.J. Howell | rock lupine | Fabaceae
|
| LUSC2 | Lupinus scaposus Rydb. | Lupinus brevicaulis | Fabaceae
|
| LUSC | Lupinus scheuberae Rydb. | Lupinus arbustus ssp. pseudoparviflorus | Fabaceae
|
| LUSEA2 | Lupinus sellulus Kellogg ssp. sellulus var. artulus (Jepson) Eastw. | Donner Lake lupine | Fabaceae
|
| LUSEL2 | Lupinus sellulus Kellogg ssp. sellulus var. lobbii (Gray ex S. Wats.) Cox | Donner Lake lupine | Fabaceae
|
| LUSEM4 | Lupinus sellulus Kellogg ssp. sellulus var. medius (Detling) Cox | Donner Lake lupine | Fabaceae
|
| LUSES3 | Lupinus sellulus Kellogg ssp. sellulus var. sellulus | Donner Lake lupine | Fabaceae
|
| LUSES | Lupinus sellulus Kellogg ssp. sellulus | Donner Lake lupine | Fabaceae
|
| LUSEU | Lupinus sellulus Kellogg ssp. ursinus (Eastw.) Munz | Donner Lake lupine | Fabaceae
|
| LUSEE3 | Lupinus sellulus Kellogg var. elatus Eastw. | Lupinus pratensis var. pratensis | Fabaceae
|
| LUSEU2 | Lupinus sellulus Kellogg var. ursinus (Eastw.) Cox | Lupinus sellulus ssp. ursinus | Fabaceae
|
| LUSE2 | Lupinus sellulus Kellogg | Donner Lake lupine | Fabaceae
|
| LUSE3 | Lupinus sericatus Kellogg | Cobb Mountain lupine | Fabaceae
|
| LUSEA3 | Lupinus sericeus Pursh ssp. asotinensis L. Phillips | Lupinus garfieldensis | Fabaceae
|
| LUSEH | Lupinus sericeus Pursh ssp. huffmanii (C.P. Sm.) Fleak & D. Dunn | silky lupine | Fabaceae
|
| LUSEM3 | Lupinus sericeus Pursh ssp. marianus (Rydb.) Fleak & D. Dunn | silky lupine | Fabaceae
|
| LUSES5 | Lupinus sericeus Pursh ssp. sabinei (Dougl. ex Hook.) L. Phillips | Lupinus sabinianus | Fabaceae
|
| LUSEE2 | Lupinus sericeus Pursh ssp. sericeus var. egglestonianus C.P. Sm. | silky lupine | Fabaceae
|
| LUSEF2 | Lupinus sericeus Pursh ssp. sericeus var. flexuosus (Lindl. ex J.G. Agardh) C.P. Sm. | silky lupine | Fabaceae
|
| LUSEM5 | Lupinus sericeus Pursh ssp. sericeus var. maximus C.P. Sm. ex Fleak & D. Dunn | silky lupine | Fabaceae
|
| LUSES4 | Lupinus sericeus Pursh ssp. sericeus var. sericeus | silky lupine | Fabaceae
|
| LUSET | Lupinus sericeus Pursh ssp. sericeus var. thompsonianus C.P. Sm. | silky lupine | Fabaceae
|
| LUSEW | Lupinus sericeus Pursh ssp. sericeus var. wallowensis C.P. Sm. | silky lupine | Fabaceae
|
| LUSES2 | Lupinus sericeus Pursh ssp. sericeus | silky lupine | Fabaceae
|
| LUSEA4 | Lupinus sericeus Pursh var. asotinensis (L. Phillips) C.L. Hitchc. | Lupinus garfieldensis | Fabaceae
|
| LUSEB2 | Lupinus sericeus Pursh var. barbiger (S. Wats.) Welsh | Lupinus barbiger | Fabaceae
|
| LUSEF3 | Lupinus sericeus Pursh var. fikeranus (C.P. Sm.) C.L. Hitchc. | Lupinus sericeus ssp. sericeus var. flexuosus | Fabaceae
|
| LUSEJ | Lupinus sericeus Pursh var. jonesii (Rydb.) Welsh | Lupinus jonesii | Fabaceae
|
| LUSEK | Lupinus sericeus Pursh var. kuschei (Eastw.) Boivin | Lupinus kuschei | Fabaceae
|
| LUSEM6 | Lupinus sericeus Pursh var. marianus (Rydb.) Welsh | Lupinus sericeus ssp. marianus | Fabaceae
|
| LUSES6 | Lupinus sericeus Pursh var. subflexuosus St. John & Warren | Lupinus sericeus ssp. sericeus var. flexuosus | Fabaceae
|
| LUSE4 | Lupinus sericeus Pursh | silky lupine | Fabaceae
|
| LUSH2 | Lupinus shastensis Heller | Lupinus albicaulis var. shastensis | Fabaceae
|
| LUSH | Lupinus shockleyi S. Wats. | purple desert lupine | Fabaceae
|
| LUSI4 | Lupinus siccosilvae C.P. Sm. | Lupinus alpestris | Fabaceae
|
| LUSIA | Lupinus sierrae-blancae Woot. & Standl. ssp. aquilinus (Woot. & Standl.) Fleak & D. Dunn | White Mountain lupine | Fabaceae
|
| LUSIS | Lupinus sierrae-blancae Woot. & Standl. ssp. sierrae-blancae | White Mountain lupine | Fabaceae
|
| LUSI2 | Lupinus sierrae-blancae Woot. & Standl. | White Mountain lupine | Fabaceae
|
| LUSI5 | Lupinus sileri S. Wats. | Lupinus kingii var. kingii | Fabaceae
|
| LUSI6 | Lupinus sinus-meyersi C.P. Sm. | Lupinus caespitosus var. utahensis | Fabaceae
|
| LUSI | Lupinus sitgreavesii S. Wats. | Lupinus argenteus ssp. argenteus var. argenteus | Fabaceae
|
| LUSP9 | Lupinus sparhawkianus C.P. Sm. | Lupinus evermannii | Fabaceae
|
| LUSPI | Lupinus sparsiflorus Benth. ssp. inopinatus (C.P. Sm.) Dziekanowski & D. Dunn | Mojave lupine | Fabaceae
|
| LUSPM | Lupinus sparsiflorus Benth. ssp. mohavensis Dziekanowski & D. Dunn | Mojave lupine | Fabaceae
|
| LUSPP | Lupinus sparsiflorus Benth. ssp. pondii (Greene) Dziekanowski & D. Dunn | Pond's Mojave lupine | Fabaceae
|
| LUSPS2 | Lupinus sparsiflorus Benth. ssp. sparsiflorus | Mojave lupine | Fabaceae
|
| LUSPA | Lupinus sparsiflorus Benth. var. arizonicus (S. Wats.) C.P. Sm. | Lupinus arizonicus ssp. arizonicus var. arizonicus | Fabaceae
|
| LUSPB3 | Lupinus sparsiflorus Benth. var. barbatulus Thornb. ex C.P. Sm. | Lupinus arizonicus ssp. arizonicus var. barbatulus | Fabaceae
|
| LUSPB2 | Lupinus sparsiflorus Benth. var. brevior Jepson | Lupinus brevior | Fabaceae
|
| LUSPI3 | Lupinus sparsiflorus Benth. var. inopinatus C.P. Sm. | Lupinus sparsiflorus ssp. inopinatus | Fabaceae
|
| LUSPM3 | Lupinus sparsiflorus Benth. var. mohavensis (Dziekanowski & D. Dunn) Welsh | Lupinus sparsiflorus ssp. mohavensis | Fabaceae
|
| LUSPP2 | Lupinus sparsiflorus Benth. var. pondii (Greene) C.P. Sm. | Lupinus sparsiflorus ssp. pondii | Fabaceae
|
| LUSPS3 | Lupinus sparsiflorus Benth. var. setosissimus C.P. Sm. | Lupinus arizonicus ssp. setosissimus | Fabaceae
|
| LUSP2 | Lupinus sparsiflorus Benth. | Mojave lupine | Fabaceae
|
| LUSPB | Lupinus spathulatus Rydb. var. boreus C.P. Sm. | Lupinus argenteus ssp. spathulatus | Fabaceae
|
| LUSP8 | Lupinus spathulatus Rydb. | Lupinus argenteus ssp. spathulatus | Fabaceae
|
| LUSP3 | Lupinus spectabilis Hoover | shaggyhair lupine | Fabaceae
|
| LUSP10 | Lupinus spiraeaphilus C.P. Sm. | Lupinus sericeus ssp. sericeus var. egglestonianus | Fabaceae
|
| LUST10 | Lupinus standingii C.P. Sm. | Lupinus arbustus ssp. neolaxiflorus | Fabaceae
|
| LUST4 | Lupinus stationis C.P. Sm. | Lupinus polyphyllus ssp. polyphyllus var. polyphyllus | Fabaceae
|
| LUST7 | Lupinus stenophyllus Rydb. | Lupinus argenteus ssp. argenteus var. laxiflorus | Fabaceae
|
| LUST6 | Lupinus stinchfieldiae C.P. Sm. | Lupinus caudatus ssp. caudatus | Fabaceae
|
| LUST3 | Lupinus stipaphilus C.P. Sm. | Lupinus arbustus ssp. neolaxiflorus | Fabaceae
|
| LUST2 | Lupinus stiversii Kellogg | harlequin annual lupine | Fabaceae
|
| LUST8 | Lupinus stockii C.P. Sm. | Lupinus arbustus ssp. neolaxiflorus | Fabaceae
|
| LUST5 | Lupinus strigulosus Gandog. | Lupinus bicolor ssp. bicolor | Fabaceae
|
| LUSU16 | Lupinus subalpinus Piper & B.L. Robins. | Lupinus arcticus ssp. subalpinus | Fabaceae
|
| LUSU | Lupinus subcarnosus Hook. | Texas bluebonnet | Fabaceae
|
| LUSU15 | Lupinus subhirsutus A. Davids. | Lupinus arizonicus ssp. arizonicus var. arizonicus | Fabaceae
|
| LUSU2 | Lupinus sublanatus Eastw. | Mono lupine | Fabaceae
|
| LUSU13 | Lupinus subsericeus B.L. Robins. ex Piper | Lupinus saxosus var. subsericeus | Fabaceae
|
| LUSU14 | Lupinus subulatus Rydb. | Lupinus sericeus ssp. sericeus var. flexuosus | Fabaceae
|
| LUSUA | Lupinus subvexus C.P. Sm. var. albilanatus C.P. Sm. | valley lupine | Fabaceae
|
| LUSUF | Lupinus subvexus C.P. Sm. var. flutivalis C.P. Sm. | Lupinus subvexus var. transmontanus | Fabaceae
|
| LUSUI | Lupinus subvexus C.P. Sm. var. insularis C.P. Sm. | Lupinus subvexus var. subvexus | Fabaceae
|
| LUSUL | Lupinus subvexus C.P. Sm. var. liebergii C.P. Sm. | Lupinus subvexus var. transmontanus | Fabaceae
|
| LUSUN | Lupinus subvexus C.P. Sm. var. nigrescens C.P. Sm. | Lupinus subvexus var. subvexus | Fabaceae
|
| LUSUP | Lupinus subvexus C.P. Sm. var. phoeniceus C.P. Sm. | valley lupine | Fabaceae
|
| LUSUS | Lupinus subvexus C.P. Sm. var. subvexus | valley lupine | Fabaceae
|
| LUSUT | Lupinus subvexus C.P. Sm. var. transmontanus C.P. Sm. | valley lupine | Fabaceae
|
| LUSU10 | Lupinus subvexus C.P. Sm. | valley lupine | Fabaceae
|
| LUSUL2 | Lupinus succulentus Dougl. ex K. Koch var. layneae C.P. Sm. | Lupinus succulentus | Fabaceae
|
| LUSU3 | Lupinus succulentus Dougl. ex K. Koch | hollowleaf annual lupine | Fabaceae
|
| LUSU4 | Lupinus suksdorfii B.L. Robins. | Suksdorf's lupine | Fabaceae
|
| LUSUD | Lupinus sulphureus Dougl. ex Hook. ssp. delnortensis (Eastw.) L. Phillips | Lupinus onustus | Fabaceae
|
| LUSUK | Lupinus sulphureus Dougl. ex Hook. ssp. kincaidii (C.P. Sm.) L. Phillips | Lupinus oreganus var. kincaidii | Fabaceae
|
| LUSUS3 | Lupinus sulphureus Dougl. ex Hook. ssp. subsaccatus (Suksdorf) L. Phillips | Lupinus bingenensis var. subsaccatus | Fabaceae
|
| LUSUA2 | Lupinus sulphureus Dougl. ex Hook. var. applegateanus C.P. Sm. | Lupinus sulphureus | Fabaceae
|
| LUSUE2 | Lupinus sulphureus Dougl. ex Hook. var. echleranus C.P. Sm. | Lupinus sulphureus | Fabaceae
|